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The air chamber 12 of the" child of the OnBike is an inner tube 12 x 1.75 with a universal valve.
This air chamber has a cylindrical shape, and is very elastic. When inflated the air chamber brings the tire to the correct pressure. The universal valve is the model Italy - Queen.
Ideal for children's bikes/or covers from the 12", they are universal rims and 17.5 mm.
Measurement: 12" x 1.75-1.90
Child
ETRTO 47-203
Valve Italy Queen 28 mm
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